How do we know that Jesus fulfills Isaiah's prophecy?

Isaiah's prophecy in chapter 49 serves as a prophetic declaration of Christ’s mission to illuminate and bring salvation to the Gentiles. This fulfillment is seen throughout the New Testament, especially in the ministry of Jesus and the apostles, who went forth into the world to preach the gospel. Paul explicitly states in Acts 26:18 that he was sent to turn the Gentiles from darkness to light, confirming the prophetic vision of Isaiah that Christ's light would reach beyond Israel and transform lives across the nations.